mu·tu·al /ˈmjuʧəwəl, ʧəl; ˈmjuʧwəl/
  (a.)相互的,彼此的;共同的,共有的
  mutual
  互
  Mu·tu·al a.
  1. Reciprocally acting or related; reciprocally receiving and giving; reciprocally given and received; reciprocal; interchanged; as, a mutual love, advantage, assistance, aversion, etc.
     Conspiracy and mutual promise.   --Sir T. More.
  Happy in our mutual help,
  And mutual love.   --Milton.
     A certain shyness on such subjects, which was mutual between the sisters.   --G. Eliot.
  2. Possessed, experienced, or done by two or more persons or things at the same time; common; joint; as, mutual happiness; a mutual effort.
     A vast accession of misery and woe from the mutual weeping, and wailing, and gnashing of teeth.   --Bentley.
  Note: ☞   This use of mutual as synonymous with common is inconsistent with the idea of interchange, or reciprocal relation, which properly belongs to it; but the word has been so used by many writers of high authority.  The present tendency is toward a careful discrimination.
     Mutual, as Johnson will tell us, means something reciprocal, a giving and taking.  How could people have mutual ancestors?   --P. Harrison.
  Mutual insurance, agreement among a number of persons to insure each other against loss, as by fire, death, or accident.
  Mutual insurance company, one which does a business of insurance on the mutual principle, the policy holders sharing losses and profits pro rata.
  Syn: -- Reciprocal; interchanged; common.
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  mutual
       adj 1: common to or shared by two or more parties; "a common
              friend"; "the mutual interests of management and
              labor" [syn: common]
       2: concerning each of two or more persons or things; especially
          given or done in return; "reciprocal aid"; "reciprocal
          trade"; "mutual respect"; "reciprocal privileges at other
          clubs" [syn: reciprocal] [ant: nonreciprocal]